Unless Trump finds a specific person who has committed a specific criminal action that has had a wide enough impact on the state's election outcome to warrant a total do-over for that state, Biden has won. A head needs to roll for this to change. Someone needs to go to jail for there to be enough of a problem in this election to do a state over.
(Btw, Trump is losing because he's down 5 points with white men, despite being up with every other demographic. He turned his back on the people who elected him and he gets what he fucking deserves.)